<ul class="nav">
    <li class="nav-item">
        <a class="nav-link active" href="${pageContext.request.contextPath}/index.jsp">Home</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="${pageContext.request.contextPath}/book/list">BookList</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="${pageContext.request.contextPath}/book/add">Add</a>
    </li>
</ul>
